Hello mekondelta,
Please, try to mount volume manually.
To do so, you need to open Terminal utility and type in the following:
mkdir /Volumes/TEST
sudo mount_ufsd_NTFS /dev/diskXsY /Volumes/TEST, there "diskXsY" - disk identifier of NTFS partition. You can get this information from Disk Utility.
Also, I would recommend you to create new support request...

After a quick turnaround from the support team, it's working fine now. Basically had a leftover v6.0 folder/files that I had migrated using Apple's Migration Assistant and deleting this folder and rebooting solved it. Excellent!